An obligate parasite, or holoparasite, is a parasitic organism that cannot complete its life-cycle without exploiting a suitable host.
Part of the Andes mountain range, Aconcagua is the second highest of the Seven Summits, behind only Mount Everest in Asia. At 22,837 feet (6,961 meters), not only is it the highest mountain in South America, it is the tallest peak in all of the Americas as well as the Southern and Western Hemispheres.
Mt. Whitney, the highest point in the continental United States, is located in Sequoia National Park and Inyo National Forest. Mt. Whitney is also on the east side of the Great Western Divide, a chain of mountains that runs north-south through the Sierra Nevada.